Synthesis of alkali-activated uncalcined Pisha sandstone cement composites

Dong, Jingliang and Zhang, Tingting and Zhu, Yingcan ORCID: https://orcid.org/0000-0003-4087-0169 and Zhang, Liqing and Jiang, Yalong and Zhu, Junhua (2021) Synthesis of alkali-activated uncalcined Pisha sandstone cement composites. Composites Part B: Engineering, 225:109311. pp. 1-12. ISSN 1359-8368


Abstract

This work reports the utilization of natural Pisha sandstone (PS) as a new precursor to manufacture a novel alkali-activated cement. The rheological properties, compressive strength, drying shrinkage, hydration properties, CO2 emission and energy consumption of the alkali-activated uncalcined Pisha sandstone cement composites (AUPC) were investigated. AUPC mortar containing 1.0 wt% of sodium hexametaphosphate and 0.2 wt% of ligneous calcium sulfonate as plasticizers showed similar rheological properties to those of ordinary Portland cement (OPC) mortar. The compressive strength of AUPC could reach 52.7 MPa after curing at 80 °C for 12 h. The increase of activator concentration (up to 4 mol/L) and the extending of curing time (up to 12 h) significantly increased the hydration of feldspar, montmorillonite and blended slag in AUPC. This resulted in the formation of more low Al/Si ratio aluminosilicate gels, calcium silicate hydrate (C-S-H) gels, and calcium alumina silicate hydrate (C-A-S-H) gels. When the concentration of NaOH and the curing time exceeded 4 mol/L and 12 h respectively, the porosity of AUPC increased, thereby lowering the compressive strength. The 90-day drying shrinkage of the AUPC with 4 mol/L NaOH activator increased from 1.68 to 3.04 mm/m when the water-to-binder ratio increased from 0.25 to 0.45. The total CO2 emissions and energy consumption for producing AUPC were estimated to be much lower than producing OPC.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Sustainable Agricultural Systems (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Sustainable Agricultural Systems (1 Aug 2018 -)
Date Deposited: 07 Mar 2022 04:57
Last Modified: 07 Mar 2022 04:57
Uncontrolled Keywords: pisha sandstone, alkali-activated cement, workability, compressive strength, drying shrinkage, sustainability
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
05 Environmental Sciences > 0503 Soil Sciences > 050302 Land Capability and Soil Degradation
Fields of Research (2020): 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410406 Natural resource management
40 ENGINEERING > 4005 Civil engineering > 400505 Construction materials
Socio-Economic Objectives (2008): B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870304 Stone, Ceramics and Clay Materials
B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Socio-Economic Objectives (2020): 12 CONSTRUCTION > 1203 Construction materials performance and processes > 120305 Stone, ceramics and clay materials
12 CONSTRUCTION > 1203 Construction materials performance and processes > 120301 Cement and concrete materials
18 ENVIRONMENTAL MANAGEMENT > 1806 Terrestrial systems and management > 180604 Rehabilitation or conservation of terrestrial environments
Identification Number or DOI: https://doi.org/10.1016/j.compositesb.2021.109311
URI: http://eprints.usq.edu.au/id/eprint/47027

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